Kyle Lassiter is a man with a past-a past shrouded in secrecy. His connections to the Marine Corps have given him the unique ability to be something of an asset when things get sticky for the great NCIS agency. Kyle's connection to the head of the agency, Secretary of the Navy Alvin Jamison, makes him a force to be reckoned with when he gets his back up. During this case, code-named-The Carrion Code-Kyle is sent to Europe to find a mysterious hacker who has somehow breached the NCIS mainframe and stolen vital information concerning their operatives working overseas. Kyle may not like it, and Ted Sayers, the Lead Agent for the NCIS team, may not like it, but they are forced to work together to stop this information from getting out. Will they find a way to put their past behind them for the good of the nation?